I was asking around and this seems to only be used by X when itstarts and we want to preserve the contents of the screen. Thatfeature is implemented by the X driver. So we need to figure how wewant to solve it.

Either way this fix should probably go into this RC series, notsure if we need to send this to stable, since we are not leakingdata to userspace (check drm_mode_getfb), but we might as well.